Word of mouth comes after people have seen ,and tried,the product and found it to stand up to ,and for ,their needs.
The Stunt school thing is not worth the time and or money invested.
As Hock said people ,like Michael Depasquale have run them and they have large areas ,with stages and mats,cars and props available CHEAP and they bring in martial artists,Like Joe Hess and others,who have been in movies as stunt men and they do not make a killing on it.
Also where is the repeat business ?
In the next stunt school ?
How many will return after the first investment of time and money.
My instructor teaches security guard courses,Women self defense courses,College self defense courses,most for free or at minimum cost and the majority of these produce zero to one person who shows interest and then they fail to return after the free introductory classes or after a few classes,as they were looking for the things done at the course rather than looking for an art/system which takes time and sweat.
Invest in Web pages and keep them up.
Hand out flyers.
Never give FREE intro classes,charge 10-20 dollars and make it applicable to the first months fee.
When they take the class ,ask them at the end if they enjoyed it ?
Pose the question so they say YES.
Then you say since you enjoyed it would you like to put tonights fee towards a months training ?
Get them to reply in the positive.
Then ask them to sign the forms for training for the month.
The more positive answers you can get them to give in your after class interview the better it is they will sign on.
Have students write positive things on the web site about the classes,allow it to be real and not staged .
Students joining ,signing on and staying for months or years become your word of mouth.
All the Best